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Chemical composition of the Taurus-Auriga association
Valentina D'Orazi, Katia Biazzo, Sofia Randich
The Taurus-Auriga association is perhaps the most famous prototype of a low-mass star forming region, surveyed at almost all wavelengths. Unfortunately, like several other young cl…
The connection between missing AGB stars and extended horizontal branches
R. G. Gratton, V. D'Orazi, A. Bragaglia +2
Recent surveys confirm early results about a deficiency or even absence of CN-strong stars on the asymptotic giant branch (AGB) of globular clusters (GCs), although with quite larg…
Abundances for a large sample of red giants in NGC 1851: hints for a merger of two clusters?
E. Carretta, R. G. Gratton, S. Lucatello +8
We present the abundance analysis of a sample of more than 120 red giants in the globular cluster (GC) NGC 1851, based on FLAMES spectra. We find a small but detectable metallicity…
X-shooter observations of main sequence stars in the globular cluster NGC 2808: first chemical tagging of a He-normal and a He-rich dwarf
A. Bragaglia, E. Carretta, R. G. Gratton +7
We present the first chemical composition study of two unevolved stars in the globular cluster NGC 2808, obtained with the spectrograph X-shooter@VLT. NGC 2808 shows three discrete…
Ba stars and other binaries in first and second generation stars in globular clusters
Valentina D'Orazi, Raffaele Gratton, Sara Lucatello +3
The determination of the Ba abundance in globular cluster (GC) stars is a very powerful test to address several issues in the framework of multiple population scenarios. We measure…
On the radial distribution of stars of different stellar generations in the globular cluster NGC 3201
Eugenio Carretta, Angela Bragaglia, Valentina D'Orazi +2
We study the radial distribution of stars of different stellar generations in the globular cluster NGC 3201. From recently published multicolour photometry, a radial dependence of…